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Gasket Values and Constants 061604-033
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Gasket Factors
ASME VIII Pressure Vessel code m & y values for KLINGERSIL ® compressed non-asbestos “C” grades
Thickness m y (psi)
Sealing liquids Up to 1/16”
Above 1/16”
2.75
6.4
2,000
2,900
Sealing gases Up to 1/16”
Above 1/16”
2.75
6.4
3,700
5,000
The use of these values will not guarantee the performance of the gasket. Factors not in the control of the
gasket material manufacturer can influence the operation of the gasket, and the m & y concept itself is being
questioned as a valid design tool.
The PVRC and ASTM are actively working on replacing the current m & y values with new gasket factors
that, if adopted, will be used for pressure vessel flange design. Although these factors have not yet been
adopted, Thermoseal Inc. contracted with Ecole Polytechnique to run the necessary tests based on the
current draft procedure required to determine the new factors which are designated Gb , a, Gs as follows:
G b (psi) a G s (psi)
KLINGERSIL ® C-4430 1377 0.220 3.4
KLINGERSIL ® C-4433 255 .430 1.1
KLINGERSIL ® C-4439 1566 0.304 0.5
KLINGERSIL ® C-4500 1475 0.204 205
Thermoseal soft-chem ® 504 0.284 2.57x10-5
KLINGERtop-chem ® -2000 56 0.616 0.05843
KLINGERtop-chem ® -2003 123 0.416 4.82x10-7
KLINGERtop-chem ® -2006 1055 0.230 2.9
Sealex ® Joint Sealant 700 0.249 2.1E+00
Although we are satisfied with the results performed by Ecole Polytechnique and the reduction of the data,
we have no direct knowledge of these factors being used, and hence cannot commit to their
appropriateness for gasket stress determination.
The ability of a gasket material to make and maintain a seal depends not only on the quality of the gasket
material, but also on medium being sealed, the flange design, the amount of pressure applied to the gasket
by the bolts and how the gasket is assembled into the flanges and tightened.
For product safety information, warranty and damage limitations, refer to the Material Safety Data Sheet
(MSDS).